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Earnings per Common Share (Tables) | 12 Months Ended
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Dec. 31, 2012
Earnings Per Share [Abstract] |
Schedule of Earnings per Common Share | The following schedule summarizes the information used to compute earnings per common share:
| Years ended December 31,
(in thousands, except per share data) | 2012 |  | 2011 |  | 2010
Net income attributable to the owners of QIAGEN N.V. | $ | 129,506 |  |  | $ | 96,038 |  |  | $ | 144,311 |
Weighted average number of common shares used to compute basic net income per common share | 235,582 |  |  | 233,850 |  |  | 232,635 |
Dilutive effect of stock options and restrictive stock units | 2,341 |  |  | 2,876 |  |  | 2,843 |
Dilutive effect of outstanding warrant shares | 2,823 |  |  | 2,338 |  |  | 5,005 |
Weighted average number of common shares used to compute diluted net income per common share | 240,746 |  |  | 239,064 |  |  | 240,483 |
Outstanding options and awards having no dilutive effect, not included in above calculation | 2,906 |  |  | 3,995 |  |  | 2,152 |
Outstanding warrants having no dilutive effect, not included in above calculation | 23,644 |  |  | 23,591 |  |  | 21,462 |
Basic earnings per common share attributable to the owners of QIAGEN N.V. | $ | 0.55 |  |  | $ | 0.41 |  |  | $ | 0.62 |
Diluted earnings per common share attributable to the owners of QIAGEN N.V. | $ | 0.54 |  |  | $ | 0.40 |  |  | $ | 0.60 |

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- Definition Tabular disclosure of an entity's basic and diluted earnings per share calculations. + References No definition available. + Details
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